diff --git a/src/include/ib_util.h b/src/include/ib_util.h
index d580573758..886138fec4 100644
--- a/src/include/ib_util.h
+++ b/src/include/ib_util.h
@@ -21,4 +21,9 @@
  * Contributor(s): ______________________________________.
  */
 
+/*
+ * Including this file is not recommended and it will be removed in the future.
+ * Please include directly the file present in the "firebird" directory.
+ */
+
 #include "firebird/ib_util.h"
diff --git a/src/include/ibase.h b/src/include/ibase.h
index a7bb67d189..9474c9c64d 100644
--- a/src/include/ibase.h
+++ b/src/include/ibase.h
@@ -41,4 +41,9 @@
  *
  */
 
+/*
+ * Including this file is not recommended and it will be removed in the future.
+ * Please include directly the file present in the "firebird" directory.
+ */
+
 #include "firebird/ibase.h"
diff --git a/src/include/iberror.h b/src/include/iberror.h
index ba66c3be7f..ffb44d3156 100644
--- a/src/include/iberror.h
+++ b/src/include/iberror.h
@@ -10,4 +10,9 @@
  * rights and limitations under the License.
  */
 
+/*
+ * Including this file is not recommended and it will be removed in the future.
+ * Please include directly the file present in the "firebird" directory.
+ */
+
 #include "firebird/iberror.h"